Capillary Porosity Depercolation/Repercolation in Hydrating Cement Pastes Via Low-Temperature Calorimetry Measurements and CEMHYD3D Modeling.
Capillary Porosity Depercolation/Repercolation in
Hydrating Cement Pastes Via Low-Temperature Calorimetry
Measurements and CEMHYD3D Modeling.
(1327 K)
Bentz, D. P.
Journal of The American Ceramic Society, Vol. 89, No.
8, 2606-2611, August 2006.
Keywords:
cements; calorimetry; porosity; cement paste;
temperature; hydration; transport properties;
durability; percolation; experiments
Abstract:
Capillary porosity percolation in a hydrating cement
paste has a large influence on transport properties and
durability. Percolation can be examined using
low-temperature calorimetry and using microstructure
models. In this paper, the two approaches are compared
for cement pastes with different water-to-cement ratios
and exposed to various curing conditions. The influence
of sealed curing is seen to be particularly important,
as cement pastes that initially hydrate to depercolate
the capillary pores may later undergo self-desiccation
and aging that repercolates them. Model predictions of
the degree of hydration and the percolated capillary
porosity volume fraction compare favorably with
experiments.
